//倒数3秒后出现蒙版和秒杀，点击叉号消失
setTimeout(function () {
    let Span = document.getElementsByTagName('span')
    let seckillWrap = document.getElementsByClassName('seckill-wrap')[0]
    seckillWrap.style.display = 'block'
    for (let i = 0; i < Span.length; i++) {
        Span[i].onclick = function () {
            seckillWrap.style.display = 'none'
        }
    }
}, 3000)